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ANDROID: KVM: arm64: Add function to report misconfigurations to pKVM.

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Add function pkvm_handle_system_misconfiguration that is used to
report misconfigurations to pKVM that can undermine its security,
so pKVM can't take the proper action.
This patch only add one event NO_DMA_ISOLATION to indicate that DMA
is not isolated and access the hypervisor.
The patch adds type pkvm_system_misconfiguration to identify the event
instead of having a void function with only one action as in the
future different events can have different responses.

Bug: 268607700
Change-Id: I9f0d2aeee25bd6bed622d327d6cbb36119c54c58
Signed-off-by: Mostafa Saleh <smostafa@google.com>
(cherry picked from commit 3e8a2f0f1a)
This commit is contained in:
Mostafa Saleh
2023-02-14 13:01:09 +00:00
parent cb5607e065
commit 2c0e439eb8
2 changed files with 23 additions and 0 deletions
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12
arch/arm64/kvm/hyp/include/nvhe/pkvm.h
View File

@@ -12,6 +12,13 @@
#include <nvhe/gfp.h>
#include <nvhe/spinlock.h>
/*
* Misconfiguration events that can undermine pKVM security.
*/
enum pkvm_system_misconfiguration {
NO_DMA_ISOLATION,
};
/*
* Holds the relevant data for maintaining the vcpu state completely at hyp.
*/
@@ -146,4 +153,9 @@ int pkvm_load_pvmfw_pages(struct pkvm_hyp_vm *vm, u64 ipa, phys_addr_t phys,
u64 size);
void pkvm_poison_pvmfw_pages(void);
/*
* Notify pKVM about events that can undermine pKVM security.
*/
void pkvm_handle_system_misconfiguration(enum pkvm_system_misconfiguration event);
#endif /* __ARM64_KVM_NVHE_PKVM_H__ */

11
arch/arm64/kvm/hyp/nvhe/pkvm.c
View File

@@ -1524,3 +1524,14 @@ bool kvm_hyp_handle_hvc64(struct kvm_vcpu *vcpu, u64 *exit_code)
return false;
}
/*
* Notify pKVM about events that can undermine pKVM security.
*/
void pkvm_handle_system_misconfiguration(enum pkvm_system_misconfiguration event)
{
if (event == NO_DMA_ISOLATION)
pkvm_poison_pvmfw_pages();
else
BUG();
}